A phase-resolved Fermi-LAT analysis of the mode-changing pulsar PSR J2021+4026 shows hints of a multipolar magnetosphere

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Table 1.

Phase-averaged spectral parameters and properties of the pulse profile in different time intervals.

Parameter	A	B	C	D	E
MJD start	54 683	55 850	57 000	58 150	59 010
MJD stop	55 850	57 000	58 150	59 010	59 493
ISO date start	2008-08-05	2011-10-16	2014-12-09	2018-02-01	2020-06-10
ISO date stop	2011-10-16	2014-12-09	2018-02-01	2020-06-10	2021-10-06
Number of days	1167	1150	1150	860	483
F_γ^(a)	8.8 ± 0.1	7.2 ± 0.1	8.6 ± 0.1	7.4 ± 0.1	8.6 ± 0.1
Γ	2.66 ± 0.02	2.80 ± 0.02	2.71 ± 0.02	2.79 ± 0.03	2.64 ± 0.02
d	0.81 ± 0.03	0.90 ± 0.05	0.82 ± 0.04	0.85 ± 0.04	0.76 ± 0.04
b	0.34 ± 0.06	0.32 ± 0.07	0.29 ± 0.06	0.32 ± 0.07	0.38 ± 0.08
E_p^(b)	850 ± 30	770 ± 20	820 ± 20	730 ± 20	790 ± 40
d_p	0.59 ± 0.02	0.64 ± 0.02	0.61 ± 0.02	0.60 ± 0.02	0.52 ± 0.03
E₁₀^(c)	9.6 ± 0.3	8.0 ± 0.3	9.2 ± 0.3	8.2 ± 0.3	9.9 ± 0.5
δ_P1^(d)	0.142 ± 0.007	0.17 ± 0.01	0.158 ± 0.007	0.118 ± 0.007	0.20 ± 0.01
δ_BR^(d)	0.30 ± 0.04	0.16 ± 0.015	0.30 ± 0.05	0.16 ± 0.03	0.30 ± 0.04
δ_P2^(d)	0.132 ± 0.003	0.164 ± 0.004	0.132 ± 0.004	0.144 ± 0.002	0.166 ± 0.008
Δ_P1−BR^(e)	0.235 ± 0.004	0.271 ± 0.004	0.229 ± 0.005	0.251 ± 0.004	0.27 ± 0.01
Δ_P1−P2^(e)	0.532 ± 0.005	0.568 ± 0.004	0.522 ± 0.006	0.544 ± 0.004	0.574 ± 0.011
P1/P2 ^(f)	0.425 ± 0.019	0.395 ± 0.016	0.46 ± 0.02	0.319 ± 0.015	0.52 ± 0.03
BR/P2 ^(f)	0.208 ± 0.012	0.19 ± 0.01	0.145 ± 0.011	0.104 ± 0.008	0.27 ± 0.02
const/P2 ^(f)	0.64 ± 0.02	0.236 ± 0.012	0.85 ± 0.03	0.385 ± 0.017	0.53 ± 0.03

Notes. Statistical uncertainties only. Columns related to high-flux states are highlighted with a gray background.

^(a)

γ-ray flux > 100 MeV, 10⁻¹⁰ erg cm⁻² s⁻¹.

^(b)

MeV.

^(c)

GeV.

^(d)

Peak full width at half maximum.

^(e)

Phase lag between peaks.

^(f)

Ratios of the peak amplitudes or constant-to-peak amplitude ratio.

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